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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa24ff7120eafc1520f5b3330d56266d4fd5803efccb61bf8dd8f86e2f6aa8b' 
  AND token = 'O8uAQ7rk6QycFvbGLExHYarNjvKR81r2AG0/6SwIdLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}